code: def expected_x_stat_t(geom):
      return dict(
          geom=geom,
          margin_side="t",
          marginal=True,
      )
  
file_path: lets-plot/python-package/test/plot/test_marginal_layer.py
imports: import pytest
  import lets_plot
label_desc: Use image node_id 2 for calling a global function with example usage: expected_x_stat_t(geom) and returns: dict